Age         Owner                  TLA  Line data    Source code

                                  1                 : /*-------------------------------------------------------------------------
                                  2                 :  *
                                  3                 :  * pgfnames.c
                                  4                 :  *    directory handling functions
                                  5                 :  *
                                  6                 :  * Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
                                  7                 :  * Portions Copyright (c) 1994, Regents of the University of California
                                  8                 :  *
                                  9                 :  * IDENTIFICATION
                                 10                 :  *    src/common/pgfnames.c
                                 11                 :  *
                                 12                 :  *-------------------------------------------------------------------------
                                 13                 :  */
                                 14                 : 
                                 15                 : #ifndef FRONTEND
                                 16                 : #include "postgres.h"
                                 17                 : #else
                                 18                 : #include "postgres_fe.h"
                                 19                 : #endif
                                 20                 : 
                                 21                 : #include <dirent.h>
                                 22                 : 
                                 23                 : #ifndef FRONTEND
                                 24                 : #define pg_log_warning(...) elog(WARNING, __VA_ARGS__)
                                 25                 : #else
                                 26                 : #include "common/logging.h"
                                 27                 : #endif
                                 28                 : 
                                 29                 : /*
                                 30                 :  * pgfnames
                                 31                 :  *
                                 32                 :  * return a list of the names of objects in the argument directory.  Caller
                                 33                 :  * must call pgfnames_cleanup later to free the memory allocated by this
                                 34                 :  * function.
                                 35                 :  */
                                 36                 : char      **
 3460 peter_e                    37 UBC           0 : pgfnames(const char *path)
                                 38                 : {
                                 39                 :     DIR        *dir;
                                 40                 :     struct dirent *file;
                                 41                 :     char      **filenames;
                                 42               0 :     int         numnames = 0;
                                 43               0 :     int         fnsize = 200;   /* enough for many small dbs */
                                 44                 : 
                                 45               0 :     dir = opendir(path);
                                 46               0 :     if (dir == NULL)
                                 47                 :     {
 1469 peter                      48               0 :         pg_log_warning("could not open directory \"%s\": %m", path);
 3460 peter_e                    49               0 :         return NULL;
                                 50                 :     }
                                 51                 : 
                                 52               0 :     filenames = (char **) palloc(fnsize * sizeof(char *));
                                 53                 : 
 3306 bruce                      54               0 :     while (errno = 0, (file = readdir(dir)) != NULL)
                                 55                 :     {
 3460 peter_e                    56               0 :         if (strcmp(file->d_name, ".") != 0 && strcmp(file->d_name, "..") != 0)
                                 57                 :         {
                                 58               0 :             if (numnames + 1 >= fnsize)
                                 59                 :             {
                                 60               0 :                 fnsize *= 2;
                                 61               0 :                 filenames = (char **) repalloc(filenames,
                                 62                 :                                                fnsize * sizeof(char *));
                                 63                 :             }
                                 64               0 :             filenames[numnames++] = pstrdup(file->d_name);
                                 65                 :         }
                                 66                 :     }
                                 67                 : 
                                 68               0 :     if (errno)
 1469 peter                      69               0 :         pg_log_warning("could not read directory \"%s\": %m", path);
                                 70                 : 
 3460 peter_e                    71               0 :     filenames[numnames] = NULL;
                                 72                 : 
 3306 bruce                      73               0 :     if (closedir(dir))
 1469 peter                      74               0 :         pg_log_warning("could not close directory \"%s\": %m", path);
                                 75                 : 
 3460 peter_e                    76               0 :     return filenames;
                                 77                 : }
                                 78                 : 
                                 79                 : 
                                 80                 : /*
                                 81                 :  *  pgfnames_cleanup
                                 82                 :  *
                                 83                 :  *  deallocate memory used for filenames
                                 84                 :  */
                                 85                 : void
                                 86               0 : pgfnames_cleanup(char **filenames)
                                 87                 : {
                                 88                 :     char      **fn;
                                 89                 : 
                                 90               0 :     for (fn = filenames; *fn; fn++)
                                 91               0 :         pfree(*fn);
                                 92                 : 
                                 93               0 :     pfree(filenames);
                                 94               0 : }